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Hi,
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Have you reset the computer
from another site
I was told that it is the screw on the backside of the speedo cluster that has KSW on it. I think?Move it tothe other hole that has KSW on it. And if I'm right that should take care of it. Let me know how it goes.

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engine runs perfect. no misfiring at all?>??????
the computer dont know,
all it knows, is a reading fails.
in electroncs we do more testing
it can be bad wires. bad connections or bad sensors.
we use a voltmeter do check this, or a scope if fast moving signal.
1991 2.8L

"Electronic Spark Timing Circuit
Specific to 1992-93 models only.
Indicates that the ECM believes the Ignition Module has failed.
Check the wires and connectors between the Distributor and the ECM."

Easy way to check plugs wires while driving, get 4 or 6 small neon lamps depending on how many cylinders,the neon lamps used in appliances to show they are on are good NOT LEDs.
Remove resistors from neon and connect one side of neon lamps together and earth to body, take other side of each lamp and solder long single telephonr wire and wind about 10 turns around each plug wire insulation a little way from plug leave end of this wire disconnected. make sure the end of wire does not earth anywhere on body leave unconnected. the high voltage going through plug wire will induce enough voltage to fire neon and show plug works if one neon does not flicker as plug fires it the bad one.
This will only show electrical misfire not injector problem.
The best time to do this test is at night neons will flicker bright at night. As a mechanic how to check injector and injector voltage.

The MAP sensor communicates the barometric pressure inside the intake manifold to the ecm.

This code can indicate either a fault in the MAP (manifold absolute
pressure) sensor, or a possible vacuum leak, either from a hose or the
intake gasket.

I would NOT drive your car until this is fixed, especially if its
running bad. Erroneous information from the sensor can cause bad
mileage, misfires, rich or lean running, which can cause catalytic
converter or valve damage if left untreated.

they are easy to replace, a new one should run less than $125, and they are fairly easy to find used in the local junkyard.

The sensor should be right there where the intake air duct meets the air filter housing.
That oil down in the spark plug tube is most likely from a leaking valve gover gasket. Oil in there can and will cause misfires.